KR20000075961A - Fungicidal compositions based on metalyxyl - Google Patents

Abstract

4- [3- (4-chlorophenyl) -3- (3,4-dimethoxyphenyl) acryloyl] morpholine ("dimethomorph") or 3-anilino-5-methyl-5- ( Metallaxyl, or pure, with a high content of at least 70% by weight of R-enantiomers, mixed with 4-phenoxyphenyl) -1,3-oxazolidine-2,4-dione ("famoxadon") R-metallaxyl exhibits clearly enhanced fungicidal action against plant diseases compared to mixtures of the same kind where metallaxyl is used in the form of racemates.

Description

Fungicidal compositions based on metalyxyl

The present invention provides an unexpectedly enhanced fungicide bicomponent mixture based on metallaxyl having an R-enantiomer content of at least 70% by weight, and the above mixture in the control and prevention of invasion by Oomycetes. It relates to the use of. The metallaxyl component is represented by active component I.

Mixing partner II is one of the following fungicides: IIA) 4- [3- (4-chlorophenyl) -3- (3,4-dimethoxyphenyl) acryloyl] morpholine ("dimethomorph") (The Pesticide Manual, 10 ^th Ed., Pages 351-2, 1994), or IIB) 3-anilino-5-methyl-5- (4-phenoxyphenyl) -1,3-oxazolidine-2,4- Dion (“Sofa Pigs”) (Brighton Crop Protection Conference, Pests & Diseases 1996, Vol. I, pages 21-26). Salts or metal complexes of compounds IIA or IIB can also be used, for example copper or manganese salts.

More specifically, the present invention relates to a mixture of pure metallaxyls having an R-enantiomer content of at least 85% by weight, in particular at least 92% by weight and more particularly at least 95% by weight. Best results are obtained using pure R-enantiomers that are substantially free of S-enantiomers.

Metallaxyl is methyl N- (2,6-dimethylphenyl) -N- (methoxyacetyl) -DL-alanine and has the structure Has

It has an asymmetric C ^* atom and can be separated into enantiomers by conventional methods (GB-1 500 581). It is known to those skilled in the art that the fungicidal action of R-enantiomers since 1975 far surpasses that of S-enantiomers, and R-enantiomers are considered to actually form the true active structure. . Commercially available metallaxyl can be purchased in the form of racemates. For practical reasons there has never been a need to separate racemates consisting of half of the desired R-enantiomers.

Not surprisingly, according to the present invention, R-metallaxyl, either in pure form or in a form concentrated at least 70% in racemate, cooperates with one of the fungicide partners IIA or IIB, some of which are racemate-based mixtures up to a factor of 10. It has been found to achieve unexpectedly highly enhanced effects that outweigh the effects of EP-280 348 or EP-393 911. Based on the R-enantiomer content of the racemate of about 50%, the predictable coefficient is at most 2.

With this unexpected result, the present invention describes the possibility of environmental protection by making very substantial improvements in the art and reducing the total application of fungicides used for controlling fungi on plants. As soon as the R-enantiomer content exceeds 70% by weight, the degradability of the significantly improved metallacyl in the soil is known from WO-96 / 01559.

In addition to the two-component mixtures I: II, the present invention also relates to a plant, such as a) component I and b) compound II, in any order, or at the site, for example, at risk of infestation by fungi or It relates to a method for controlling fungi, including treatment at the same time.

Preferred I: II mixing ratios of the two components are from 30: 1 to 1:30, in particular from 10: 1 to 1:10, more particularly from 10: 1 to 1: 5. In many cases, mixtures in which the mixing ratio of compound I to compound II is 1: 1 to 1: 5 are advantageous.

The compound mixture I + II according to the invention has very favorable therapeutic, prophylactic and penetrating fungicide properties for the protection of cultivated plants. The compound mixture of the present invention can be used to inhibit or control microorganisms occurring in the organs of plants (fruit, flowers, leaves, stems, or roots) of various crops of plants or useful plants, and then to control the organs of plants that grow. It also protects against the microorganisms. It is also particularly suitable for microorganisms which exhibit reduced sensitivity to metallaxyl.

Mixtures of compounds I and II are commonly used in the form of compositions. R-Metalaxyl (I) and Compound II may be applied simultaneously or immediately following the area or plant to be treated, if necessary, with additional carriers, surfactants or other application-promoting additives customary in formulation technology. .

Suitable carriers and additives may be solid or liquid and are convenient materials in the formulation art, for example natural or renewable minerals, solvents, dispersants, wetting agents, tackifiers, thickeners, binders or fertilizers.

A preferred method of applying a compound mixture comprising at least one of each of compounds I and II is the application of plants on the soil, in particular to leaves (leaving applications). The frequency of application and the amount of application depend on the biological and climatic survival conditions for the pathogen in question. The compound may also penetrate into the plant via the root organs via the soil (infiltration) either as a result of impregnating the site of the plant with the liquid formulation or by injecting the compound into the soil in solid form, for example in the form of granules ( Soil application).

The compounds in the formulation can be used in unmodified form or preferably in combination with auxiliaries commonly used in formulation techniques, in known manner emulsifiable concentrates, coating pastes, directly sprayable or dilutable solvents, dilute emulsifiers, Formulated by wettable powders, soluble powders, powders or granules or by encapsulation in a material, for example a polymeric material. Depending on the nature of the composition, the method of application, such as spraying, preparative, scattering, scattering, applying or injecting, is selected to suit the intended goal and prevailing environment. The preferred application amount of the compound mixture is generally from 50 g to 1800 g, in particular from 100 g to 1000 g a.i./ha of the active ingredient (a.i.) per hectare (ha).

The formulations are prepared in a known manner, for example by homogeneously mixing and / or grinding the active ingredient with a solvent, a solid carrier and, if necessary, an extender such as a surface-active compound (surfactant).

Agrochemical compositions typically comprise from 0.1 to 99%, in particular from 0.1 to 95% by weight of the compounds of formulas (I) and (II), from 99.9 to 1% by weight of solid or liquid auxiliaries, in particular from 99.9 to 5% by weight, and from 0 to 0% of surfactant. 25% by weight, in particular 0.1 to 25% by weight.

Commercially available products are preferably formulated as concentrates, so end users typically use dilute formulations.

Suitable target crops are especially potatoes, vines, hops, corn, sugar beets, tobacco, vegetables (tomatoes, paprika, lettuce, etc.), and also bananas, gums, grasses and ornamental plants. Plants other than those endangered by downy mildew are known in particular from the literature on metallaxyl.

The following examples illustrate the invention, where "active ingredient" means a mixture of metallaxyl (with R-metallaxyl content of at least 95% by weight) and compound II in a specific mixing ratio.

Wettable powder a) b) c)

Active ingredient [I: IIA = 1: 1 (a),

1:10 (b); I: IIB = 1: 5 (c)] 26% 44% 72%

Sodium Lignosulfonate 5% 5%-

Sodium Lauryl Sulfate 3%-5%

Sodium Diisobutylnaphthalene Sulfonate-6% 10%

Octylphenol Polyethylene Glycol Ether-2%-

(Ethylene oxide 7-8mol)

Highly dispersed silicic acid 6% 13% 13%

Kaolin 60% 30%-

The active ingredient is thoroughly mixed with the adjuvant and the mixture is thoroughly milled into a suitable mill to give a wettable powder dilutable with water to provide a suspending agent of the desired concentration.

Emulsifiable concentrate

12% active ingredient (I: IIA or IIB = 2: 1)

Octylphenol polyethylene glycol ether (ethylene oxide 4-5mol) 3%

Calcium Dodecylbenzenesulfonate 3%

Beaver oil polyglycol ether (35 mol ethylene oxide) 4%

Cyclohexanone 30%

Xylene Mixture 48%

The emulsifiers of the desired dilution usable for plant protection can be obtained from the concentrate by dilution with water.

Extruded granules

Active ingredient (I: IIA = 1: 1) 16%

Sodium lignosulfonate 2%

Carboxymethylcellulose 1%

Kaolin 81%

The active ingredient is mixed and mixed with the adjuvant, and then the mixture is wetted with water. The mixture is extruded and then dried in an air stream.

Coated granules

Active ingredient (I: IIB = 10: 1) 11%

Polyethylene glycol (200 mol. Weight) 3%

Kaolin 86%

The finely ground active ingredient is applied to kaolin, which is wetted with polyethylene glycol in a uniform mixer. Non-dispersible coated granules are obtained by the above method.

Suspension Concentrate

Active ingredient (I: IIA or IIB = 1:10) 44%

Polyethylene Glycol 10%

Nonylphenol Polyethylene Glycol Ether (15 mol ethylene oxide) 6%

Sodium Lignosulfonate 10%

Carboxymethylcellulose 1%

1% silicone oil (75% aqueous emulsion form)

Water 28%

The finely divided milled active ingredient is homogeneously mixed with the adjuvant to provide a suspension concentrate from a suspension of the desired dilution obtainable by dilution with water. The diluent can be used to treat and protect surviving plants from invasion by microorganisms by spraying, irrigation or dipping.

Biological Example

Example 1 Actions on Plasmopara viticola on Vine

Vine seedlings of the Gutedel variety are grown in 4- to 5-leaf stages (3 weeks) under greenhouse conditions (20-24 ° C.). Next, a disk with a diameter of 10 mm is cut out of the leaves. Place leaf pieces in Petri dishes with their top side down. The dish contains 1.8 ml water / 0.16% agar. Fungicides are added to demineralized water and diluted appropriately. Fungicide treatment is performed one day prior to inoculation. Next, a spore sac suspension of freshly prepared Plasmopara viticola (50000-60000 / ml) is sprayed onto the entire leaf surface disc to drop down. The plant is subsequently left in a controlled environmental chamber for 7 days with 12 hours of artificial sunlight (3000 lux) at 18 ° C. and about 100% relative humidity. Next, an evaluation of the degree of infringement is performed.

The leaf invasion rate is assessed and the action rate proportional to the control is calculated. Comparison coefficients are provided by comparison with the mixture R-metallaxyl (> 95% by weight) / paroxone and the mixture metallaxyl (racemate) / paroxone.

R-metallaxyl> 95% by weight or metallaxyl (racemate) mg a.i./l Soybean sapon mg a.i./ℓ Mixing ratio I: II R-metallaxyl (95%) + activity of sofasa pig % Activity of metallaxyl (racemate) + seeding pig Comparison factor 0.1 0.1 1: 1 29.1 3.1 9.5 0.1 0.5 1: 5 52.7 14.9 3.5 0.1 One 1:10 52.7 22.0 2.4

Example 2 Action on Phytophthora infestans on Tomato

Varieties cv. Baby tomato seedlings are grown in pots (diameter = 8 cm) for 4 weeks under greenhouse conditions. The plants are then sprayed with the active ingredient formulations prepared from emulsifiable concentrates. Three seedlings are used in each case. Spray a freshly prepared spore sac suspension (80000 / ml) of Plasmopara infestans on the entire leaf surface of the bottom leaf of the plant. The plant is subsequently left for 2 days with 16 hours of artificial sunlight at 18 ° C. and about 100% relative humidity and for an additional 5 days at 15 ° C. and 60% relative humidity. Next, an evaluation of the degree of infringement is performed.

The leaf invasion rate is assessed and the action rate proportional to the control is calculated. Comparison coefficients are provided by comparison with the mixture R-metallaxyl (> 95% by weight) / dimethomorph and the mixture metallaxyl (racemate) / dimethomorph.

R-metallaxyl> 95% by weight or metallaxyl (racemate) mg a.i./l Dimethomorph mg a.i./ℓ Mixing ratio I: II % Activity of R-metallaxyl (95%) + dimethomorph % Activity of metallaxyl (racemate) + dimethomorph Comparison factor 0.25 0.25 1: 1 86.0 16.0 5.3 0.25 0.5 1: 2 87.0 39.0 2.2

Claims (11)

At least 70% by weight of the metallaxyl consists of R-enantiomer (I) and the composition consists of IIA) 4- [3- (4-chlorophenyl) -3- (3,4-dimethoxyphenyl) acrylic as an additional component. Royl] morpholine ("dimethomorph") or IIB) 3-anilino-5-methyl-5- (4-phenoxyphenyl) -1,3-oxazolidine-2,4-dione (" Disinfectant two-component composition based on metallaxil, comprising either pamoksadon "), or a salt or metal complex of component IIA or IIB together with a suitable carrier. The composition of claim 1 wherein the weight ratio of I: II is 30: 1 to 1:30, preferably 10: 1 to 1:10. The composition of claim 1, wherein the R-enantiomer content of the metallaxyl is at least 85% by weight. 4. A composition according to claim 3, wherein the R-enantiomer content of the metallaxyl is at least 92% by weight, preferably at least 95% by weight. The composition of claim 4 wherein pure R-metallaxyl is used that is substantially free of S-enantiomers. The compound of claim 1, wherein 4- [3- (4-chlorophenyl) -3- (3,4-dimethoxyphenyl) acryloyl] morpholine ("dimethomorph", IIA) is R-metallaxyl. A composition used as a mixing partner for. The compound of claim 1, wherein 3-anilino-5-methyl-5- (4-phenoxyphenyl) -1,3-oxazolidine-2,4-dione ("famoxadon", IIB) is selected from R- Compositions used as mixing partners for metallaxyl. Metallaxyl having an R-enantiomer content of at least 70% by weight, and additional fungicide partners selected from dimethomorph (IIA) and pamoxadon (IIB), either simultaneously or in any order, directly or sequentially And methods for controlling and preventing invasion by fungi on plants, plant organs or their growth sites. The process according to claim 8, wherein the R-enantiomer content of the metallacyl is at least 85% by weight, in particular at least 92% by weight. 10. The process of claim 9, wherein pure R-metallaxyl is used that is substantially free of S-enantiomers. The method according to claim 8, comprising: Phytophthora species, Plasmopara, Pytium, Pseudoperonospora, Albugo occidentalis and / or Bremia ( How Bremia is controlled.